These are for a party. You can use full sized rye for larger sandwiches.
Place half of the cocktail rye bread on a clean work surface. Spread each slice with cream cheese.
Place 1 or 2 slices of cucumber on each, and then 1 or 2 slices of onion.
Spread remaining slices with mayonnaise and place atop onions to complete the sandwiches.
Per Serving: 194 calories; protein 2g; carbohydrates 4.5g; fat 19.2g; cholesterol 25mg; sodium 147.7mg.